Auto-update (Squirrel / update-electron-app)

Debugging update failures reported by users, or changing updater/debug-report code.

• The update feed URL shape is https://api.dyad.sh/v1/update/{stable|beta}/dyad-sh/dyad/<platform>-<arch>/<version>/RELEASES (built by update-electron-app from the host set in src/main.ts). To check server health, curl that exact shape — a malformed path (e.g. missing the dyad-sh/dyad/... segments) gets a 307 redirect to the repo homepage, which looks "up" but is not a valid feed response.
• Windows Squirrel.FileDownloader.DownloadUrl stack traces that start at --- End of stack trace --- are missing the head line with the real exception (System.Net.WebException: ...). Cause: update-electron-app logs updater errors at info level, and the warn-filtered bug-report logs drop [info]-prefixed lines while keeping unprefixed stack-trace continuation lines. Fixed by an error-level autoUpdater.on("error") handler in src/main.ts; old reports still show only tails.
• The full .NET inner-exception chain persists across restarts in Squirrel's own log next to Update.exe: %LocalAppData%\dyad\SquirrelSetup.log. Debug bundles capture its tail via readUpdaterLogs() in src/ipc/handlers/debug_handlers.ts (updaterLogs field).
• Bug-report bodies travel in the GitHub issue-creation URL (openGitHubIssue in HelpDialog.tsx), so any new log section added there must be tightly size-capped (~1-2k chars) to avoid overlong URLs. When capping updater logs, reserve space for the Last updater error (this session) block; blindly taking the tail can keep only Squirrel stack tails and drop the root cause. Do not split updater log sections on arbitrary blank lines because .NET exception text can contain internal blank lines; use known section headers such as Squirrel*.log (tail):.
• Session upload bundles are POSTed and can carry larger updater log tails, but every new uploaded debug field must also be rendered in the HelpDialog review screen so users can inspect it before submitting.